The true statement about this step of completing the wireframe step of mobile app development is: option C.
A wireframe can be defined as a simplified and schematic visual prototype of a software such as a mobile app, and it's focused explicitly on the skeletal framework (layout, behavior, and content) of the software.
Basically, a wireframe serves as a blueprint for UX designers and it usually doesn't include any graphics or styling. Thus, when you draw pictures of what the screens of a mobile app would look like and identify the input-process-output that occurs on each screen, you have completed the wireframe step of mobile app development.
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